Periodic table Flashcards
(11 cards)
1
Q
Non metals
A
- Non metals don’t form positive ions
- Brittle, dull looking, don’t conduct electricity
- Towards top right of periodic table
2
Q
Metals
A
- High melting point
- Metals do form positive ions
- Strong, malleable, good conductor
- Towards the bottom left of periodic table
3
Q
Group 0
A
- Noble gases
- Point increases down the group
- Unreactive, full outer shell, stable
4
Q
Group 7
A
- Halogens
- Displacement
- More reactive halogens displace less reactive halogens
- Molecules of two atoms, E.g. Cl2
- Down the group - reactivity decreases, melting and boiling points increases, harder to gain an electron
5
Q
Group 1
A
- Alkali metals
- one electron in outer shell - very reactive
- form ionic compounds reacts with - water, oxygen, chlorine
6
Q
Period
A
- Row
- Each period represents new shell of electrons
7
Q
Position
A
Used to predict reactivity
- E.g. Group 1 reacts more violently down the group
8
Q
Group
A
- Colum
- Group number equals number of outer shell electrons
- Elements in the same group have similar chemical properties
9
Q
Development - The first table
A
- Initially periodic tables were ordered by atomic weight
- Early tables were incomplete
- Some elements placed in incorrect groups
10
Q
Development - Second table
A
- Was made by Mendeleev
- Didn’t follow strict atomic mass
- Ensured elements with similar properties lined up in groups
- Left gaps
- Undiscovered elements
11
Q
After Mandeleev
A
- Isotopes were discovered
- Same chemical properties
- Different atomic masses
